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Share-based Compensation - Additional Information (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Inventory
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share based compensation cost capitalized	$ 3.1	$ 3.1
Property, Plant and Equipment, Net
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share based compensation cost capitalized	$ 0.6	$ 0.0

X

- Definition

Employee service share based compensation allocation of recognized period costs capitalized amounts.

+ References

No definition available.

+ Details

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Namespace Prefix:	alks_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_BalanceSheetLocationAxis=us-gaap_InventoriesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_BalanceSheetLocationAxis=us-gaap_PropertyPlantAndEquipmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: